Simple past tense and past participle of muster.(verb)
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Use "mustered" in a sentence
"Sundin mustered one shot and has not scored in his last 13 contests."
"Clayley was elected first lieutenant, and in a week from that time the company was "mustered" into the service of the United States government, and armed and equipped as an independent corps of "Rifle"
"He argued that the Senate had a right to debate our resolution once it became the business of the day and that, since standing rules required a two-thirds majority to end debate, he should be able to debate it until we mustered a two-thirds majority to stop him."